Each contestant went through rigorous exams before beginning to make sure they did not have any health problems and the doctors felt confident they could withstand such an abnormal routine. They also have doctors and an ambulance on standby, and they have needed them. Plus they don't recommend the rest of us do what they do. I've also been told that while the show makes it look they are doing weekly weigh ins, the pre-taped shows are actually 2 weeks apart so the losses aren't as dramatic as they look but they are still too extreme for the rest of us.
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